Machine for generating and marking cams



30, 1928. 1,689,370 K. TESSKY MACHINE FOR GENERATING AND MARKING CAMS Filed June 9, 1.925 2 Sheets-Sheet 1 eat 2 2 Sheets? Filed June 9: i925 K TESSKY MACHINE FOR GENERATING AND MARKING CAMS Patented Oct.. 30, 1928.

UNITED STATES PATENT OFFICE.

KARL T1385, 01' ESSLINGEN, GERMANY.

CHINE 'IOB GENERATING AND MARKING CAMS.

Application fled June 9, 1925, Serial No. 35,898, andin Germany June 7, 1924.

My invention relates to a machine for generating and marking cams which is equally suitable for generating or marking cams of the disc as well as of the end type, such cams being used for instance in connection with automatic or semi-automatic machine-tools.

As a rule cams of the kind described are generated by means of a master cam, which involves the' drawback that a separate master cam is required for each type of cam to be generated.

It is an object of my invention to altogether eliminate the necessity of employing master cams and to provide simple, reliable and efficient means by which an infinite variation of types of cams can be generated on a single machine by suitable adjustment.

To this end I provide a tool support which in generating the cam performs exactly the same motion with regard to this cam which the roller of the cam lever will perform when the cam is in operation. As a rule such roller is mounted at the end of a cam lever and I therefore provide a rocking tool support of exactly the same length as said cam lever and I arrange the fulcrum about which said support rocks in exactly the same position with regard to the axis of the cam, as the fulcrum of the cam lever when the cam is in operation. A carriage is arranged to bereciprocated in the frame of the machine by means of suitable gearing, a guide arranged on this carriage being adapted to be adjusted at an angle to its direction of reciprocation. The guide is operatively connected with the tool support in such manner that its reciprocation with the carriage is changed so as to impart motion to the tool support. The ratio at which such motion is transmitted is determined by the angular position of the guide on said carriage.

By adjusting the guide on the carriage and by varying its rate of reciprocation it is possible to vary practically infinitely the motion of the tool support so that any desired number of different cams can be generated on a single machine without requiring a master cam.

In the drawings aflixed to this specification and forming part thereof a machine embodying my invention is illustrated diagrammatically by way of example.

In the drawings Fig. 1 is an elevation,

- Fig. 2 is a plan view of the machine, parts of the tool actuating mechanism being broken away,

Fig. 3 is an end elevation of the tool carrying head,

Fig. 4 is a similar elevation showing a frame for supporting the arbour,

Fig. 5 is an. elevation of a cam adapted to be generated on the machine,

Fig. 6 is a plan view of the left hand end of the machine, showing the gear box in which i is the axis of the cam, and a and b are the horizontal and vertical distances, respectively, separating the fulcrum 4 from said axis 6.

Referring now to Figs. 3 and 4, the cutting tool 5, as a rule a milling cutter, is rotatably carried at one end of a support 9 which is seated on and adapted to rock about the driv-' ing shaft 13 of the tool-carrying head A. The length of the support 9, that-is the distance between the axes of the tool 5 and the shaft 13 is equal to the length. of the rocking lever 3, 4 with which the finished cam is to cooperate and the axis 6 of the arbour on which the blank for the cam 1 is chucked, is so located as to be at the correct horizontal and vertical distance a, b from the axis of the shaft 13, as shown in Fig. 4.

It will be understood that the length 3, 4 and the distances a and b are variable, and it is therefore necessary to make the support 9 exchangeable'and to vary the relative position of the arbour 60 and the shaft 13 for each type of cam to be marked or generated. In order to facilitate the location of the arbour 60 .I provide an exchangeable frame 10 having an eye for the driving shaft 13 at one end and a bearing for the arbour 60 at the other end.

A third eye on the frame is adapted to receive a locating pin 11 for holding the frame 10 in position on the gear box 28.

Any suitable means which are well known in this art and therefore not shown and described, may be provided for adjusting the head A vertically and the frame C horizontally on a V-guide E and at right angles thereto.

Any suitable means may be provided for 52 and 53, the intermediate .gear 52 being mounted on the support 9 by means of a quadrant 54. Such gearing is well known in the art and need not be described in detail.

As mentioned, the support 9 is exchangeable in each individual case, and it will be understood that the support also absorbs the reaction of the milling cutter or the component of such reaction which extends in the longitudinal axis of the sup ort and the component is thus unable to e ect an undesirable displacement of any part of the cutter 5. Y

The milling cutter is conducted along the curve to be milled in the blank 1 by means of a push rod 12 linked to the support 9 at one end and to a rack 15 at the other. This rack is slidably supported in a bracket B secured to the frame C of the machine, and its teeth 16 mesh with a segment 17 on a transverse shaft 18 which is also supported in the bracket B (Fig. 7). Another segment 19 is keyed to the shaft 18 and meshes with a second rack 20 extending in parallel to the rack 15. A block 21 is adjustably secured in a. slot of the rack 20 and adapted to engage a groove 22 in a straight edge 23. The straight edge is adapted to be adjusted in an inclined position on a. carriage 24, which can be displaced longitudinally by means of a screw spindle 25 in the frame C. r

Rotation is imparted to the spindle 25 from a pulley 26 through the medium of a gearing whichis indicated in ageneral manner at D but is not described, as those skilled in the art are acquainted with mechanism of this kind. The gearingD also rotates a shaft 27 which is rotatably carried in a gear box 28, and operates the shaft j29- of a'worm 30 through the medium of bevel gearing 31. W'orin 3O meshes with a worm wheel 32 keyed on the arbour so that the blank 1 is also rotated from the driving'pulley 26. A reversing gear of some suitable type (not shown) is inserted between the shaft 25 and the gearing D, so that carriage 24- is automatically returned to its initial position after having attained its opposite final position.

The reciprocation of the carriage 24 imparts-a corresponding reciprocation to the rod 12' andto the support 9 of'the milling cutter 5. The-curve generated in the blank 1 will correspond to the position of the straight-edge 23 and the ratio atwhich the slide 24 is reciprocated and the blank 1 is rotated from the gearing D. Curves of any shape ano gradient may be generated on the entire perimeter of the blank or on a part thereof, as desired.

As illustrated in Fig. 6, thegear box 28 is adapted to be displaced from its position in Fig. 2 through an angle of 90 degrees. A. shaft 33 is rotatably supported in the gear box 28 and connected with the shaft 27- through the medium of the bevel gearing 31. In the position shown in Fig. 6 the last wheel of the gearing D is keyed to the shaft 33, instead of the shaft 27, and this shaft is now running idle while the shaft 33 imparts rotation to the arbour 60. In this case the workpiece is a blank 100 and the curve is generated at its end by the cutter 5.

If it is desired to mark a cam instead of generating a curve thereon, the milling cutter 5 is exchanged for a marking implement (not shown). I wish it to be understood that I do not desire to be limited to the exact details of construction shown and described, for obvious modifications will occur to a person skilled in the art.

I claim 1. .A machine for generating the faces of cams which cooperate with rollers on rocking levers, comprising a frame, a chuck on said frame for holding a blank, a-tool support in the shape of a rocking lever of a length equal to'that of the cam lever in a machine of which said cam-and-lever-unit will form part, said rocking lever being pivoted on said frame in a position with respect to said blank which corresponds to the relative position of-the finished cam and the pivot of its cooperating rocking lever, a tool carried on said support in a position corresponding to the roller of said cooperating rocking lever, a carriage adapted to reciprocate on said frame, a slide bar supported on said carriage, and means for connecting said slide bar with said tool-supporting rocking lever so as to transmit the reciprocation of said carriage to said rocking lever at a ratio corresponding to the adjustment of said sllde bar with respect to said carriage.

2. A machine for generating the faces of cams which cooperate with rollers on rocking levers, comprising a frame, a chuck on said frame for holding a blank, a tool support in the shape of a rigid exchangeable rocking lever of a length equal to that of the cam lever in a machine of which said cam-andlever-unit will form part, sai'd rocking lever being pivoted on said frame in a position with respect to said blank which corresponds to the relative position of the finished cam and the pivot of its cooperating rocking lever, a tool carried on said support in a position corresponding to the roller of said cooperating rocking lever, a carriage adapted to reciprocate on said-frame, a slide bar supported on said carriage, and means for connecting said, slide bar with said tool-supporting rocking lever so as to transmit the reciprocation of said carriage to said rocking lever at a ratio corresponding to the adjustment of said slide bar with respect to said carriage.

In testimony whereof I atlix my signature. KARL TESSKY. 

